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Particle-in-cell simulations of the impact of retarding field analyser probe head geometry on ion saturation current measurements

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    SYSNO ASEP0103214
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JOstatní články
    TitleParticle-in-cell simulations of the impact of retarding field analyser probe head geometry on ion saturation current measurements
    TitleParticle-in-cell simulace vlivu tvaru hlavice sondy Retarding field analyzátoru na měření iontového nasyceného proudu
    Author(s) Pánek, Radomír (UFP-V) RID
    Pitts, R. A. (CH)
    Gunn, J. P. (FR)
    Erents, S. K. (GB)
    Source TitleCzechoslovak Journal of Physics. - : Springer - ISSN 0011-4626
    Roč. 54, suppl.C (2004), C150-C156
    Number of pages7 s.
    Publication formCD-ROM - CD-ROM
    ActionSymposium on Plasma Physics and Technology /21./
    Event date14.06.2004-17.06.2004
    VEvent locationPraha
    CountryCZ - Czech Republic
    Event typeWRD
    Languageeng - English
    CountryCZ - Czech Republic
    Keywordsretarding field analyser, magnetic pre-sheath, plasma flow, tunnel effect
    Subject RIVBL - Plasma and Gas Discharge Physics
    R&D ProjectsGP202/03/P062 GA ČR - Czech Science Foundation (CSF)
    CEZAV0Z2043910 - UFP-V
    AnnotationThe Retarding Field Analyser (RFA) is essentially the only practical tool for the measurement of ion energies parallel to the total magnetic field in the tokamak scrape of layer plasma. One such device has recently been successfully employed at JET. Its bi-directional nature allows both measurements of ion temperature and plasma flow velocities. The latter are computed by collecting the ion saturation flux to negatively biased entrance slit plates which are set back inside a boron nitride protective housing. When comparing the RFA slit currents with those measured by a turbulent transport probe (TTP), the RFA fluxes are found to be a factor 4-5 lower for very similar plasma conditions. Using Particle-in-Cell (PIC) simulations, this contribution demonstrates unambiguously and quantitatively, that the RFA flux attenuation is induced by the magnetic pre-sheath formed in the orifice in front of the slit plates.
    WorkplaceInstitute of Plasma Physics
    ContactVladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975
    Year of Publishing2005
Number of the records: 1  

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